Playback of an unencrypted portion of an audio stream

ABSTRACT

This disclosure concerns the providing of media, and more particularly to the streaming of media. In one example embodiment of a method for streaming an audio content item to an electronic device, the method comprises: receiving a first data message comprising instructions from an electronic device to return a preview segment associated with a selected audio content item, the preview segment being a portion of the selected audio content item; retrieving said selected audio content item from a first storage; analyzing audio content of the retrieved audio content item to locate a portion of the selected audio content item to be used as the preview segment; extracting the located portion of the selected audio content item from the retrieved audio content item; and transmitting the extracted portion of the selected audio content item unencrypted to the electronic device.

CLAIM OF PRIORITY

This application is a continuation of, and claims the benefit ofpriority to, U.S. patent application Ser. No. 16/355,467, titled“PLAYBACK OF AN UNENCRYPTED PORTION OF AN AUDIO STREAM”, filed Mar. 15,2019, which application is a continuation of, and claims the benefit ofpriority to, U.S. patent application Ser. No. 14/714,138, titled“PLAYBACK OF AN UNENCRYPTED PORTION OF AN AUDIO STREAM”, filed May 15,2015; each of which above applications are herein incorporated byreference.

COPYRIGHT NOTICE

A portion of the disclosure of this patent document contains materialwhich is subject to copyright protection. The copyright owner has noobjection to the facsimile reproduction by anyone of the patent documentor the patent disclosure, as it appears in the Patent and TrademarkOffice patent file or records, but otherwise reserves all copyrightrights whatsoever.

FIELD OF INVENTION

The present disclosure generally relates to the providing of media, andmore particularly to the streaming of media. In particular, theembodiments described herein relate to methods and computer serversystems for streaming an audio content item to an electronic device,whereby a portion, or part, of a selected audio content item can betransmitted unencrypted to the electronic device. The embodimentsdescribed herein also relate to corresponding methods and electronicdevices for playback of an audio content item.

BACKGROUND

This section is intended to provide a background to the technologydescribed in this disclosure. This background may include concepts thatcould be pursued, but are not necessarily ones that have been previouslyconceived or pursued. Therefore, unless otherwise indicated herein, whatis described in this section is not prior art to the description and/orclaims of this disclosure and is not admitted to be prior art by themere inclusion in this section.

As computer technology has improved, the digital media industry hasevolved greatly in recent years. Users are able to use electronicdevices such as mobile communication devices (e.g., cellular telephones,smart phones, tablet computers, etc.) to consume music, video and otherforms of media content. For instance, users can listen to audio content(e.g., music) and/or watch video content (e.g., movies, television (TV)broadcasts, etc.) on a variety of electronic devices.

At the same time, advances in network technology have increased thespeed and reliability with which information can be transmitted overcomputer networks. It is therefore possible for users to stream mediacontent over computer networks as needed, or on demand, rather thantransmitting a complete file in physical media (such as CD or DVD, ordownloading the entire file) before consuming the media content.

Some music streaming services allow users to browse a catalog, orcollection, of songs and to select song(s) from the catalog. When usingthe music streaming service, the user can thus browse a multitude ofsongs, or albums of songs, and listen to short preview segments of thesesongs. At the same time, content owners typically desire its content tobe protected from unauthorized copying, or theft. Therefore, in order toprotect the content it is common that content owners require encryptionof the content, and/or related technical measures. Decryption ofencrypted content commonly involves exchange of cryptographic keys andadditional communications between the computer server system thatprovides the music streaming service and the electronic device thatplaybacks the music. When browsing a multitude of encrypted shorterpreview segments of the songs, the additional time associated with theexchange of cryptographic keys and/or the additional communicationsbetween the computer server and the electronic device may result in adelay of the playback of the preview segments of the songs. The browsingof music may therefore be perceived as unnecessarily time consuming and,hence, cumbersome to some users. Also, despite the advances in computernetwork speed and reliability, some existing solutions for streamingmusic may involve relatively long loading times of the encrypted previewsegments of these songs. This may e.g. be particularly true whentransitioning, or switching, between various encrypted preview segmentswhen utilizing a wireless network with limited bandwidth. Thus, if auser attempts to scan, or browse, through several selectable songs of acollection of songs over such network, the user may sometimes experiencebreaks when loading the encrypted shorter preview segments of the songs.This may be perceived as frustrating or annoying to some users,particularly at times when the user cannot devote all of his/herattention to making the selection or at times when he/she wants or needsto locate a particular song quickly.

SUMMARY

It is in view of the above considerations and others that the variousembodiments disclosed herein have been made.

It is a general object of the embodiments described herein to allow foran improved way of browsing audio content items such as songs, which, atthe same time, allows for sufficient protection against unauthorized useof the streamed audio content items.

This general object has been addressed by the appended independentclaims. Advantageous embodiments are defined in the appended dependentclaims.

According to a first aspect, a method for streaming an audio contentitem to an electronic device is provided. The method is performed by, orotherwise executed in, a computer server system. Typically, the computerserver system comprises a single computer server, or alternatively, aplurality of computer servers. The method comprises: receiving a firstdata message comprising instructions from an electronic device to returna preview segment associated with a selected audio content item, thepreview segment being a portion of the selected audio content item;retrieving said selected audio content item from a first storage;analyzing audio content of the retrieved audio content item to locate aportion of the selected audio content item to be used as the previewsegment; extracting the located portion of the selected audio contentitem from the retrieved audio content item; and transmitting theextracted portion of the selected audio content item unencrypted to theelectronic device.

In some embodiments, retrieving said selected audio content item fromthe first storage comprises retrieving the entire selected audio contentitem from the first storage.

In some embodiments, the method comprises partially encrypting theselected audio content item by encrypting an unextracted portion of theaudio content item and leaving the extracted portion of the selectedaudio content item unencrypted. In one embodiment, the method alsocomprises transmitting the partially encrypted audio content item to theelectronic device.

In some embodiments, the method further comprises receiving a seconddata message including instructions from the electronic device to returnthe entire selected audio content item; retrieving the entire selectedaudio content item from a second storage; encrypting the entireretrieved audio content item; and transmitting the encrypted audiocontent item to the electronic device. In some embodiments, the firststorage and the second storage are a same storage. In alternativeembodiments, the first storage and the second storage are differentstorages, which are separate from each other.

In some embodiments, analyzing audio content of the retrieved audiocontent item to locate a portion of the selected audio content item tobe used as the preview segment comprises analyzing the audio contentfrom only a portion of the retrieved audio content item. Said portion ofthe retrieved audio content item may comprise a portion having apredefined duration. This predefined duration may for example be 30seconds, 60 seconds or 90 seconds. Furthermore, said portion may be aportion at the beginning of the retrieved audio content item.

In some embodiments, analyzing audio content of the retrieved audiocontent item comprises: evaluating an audio pattern of the audio contentitem; and locating said portion of the selected audio content item to beused as the preview segment based on the evaluation of the audiopattern. In one embodiment, the method comprises evaluating amplitudevariations of the audio content item; and locating said portion of theselected audio content item to be used as the preview segment based onthe evaluation of the amplitude variations. For example, the method maycomprise evaluating amplitude variations of the audio content item onlyfor a pre-defined duration at the beginning of the audio content item;and locating said portion of the selected audio content item to be usedas the preview segment by identifying a location of the audio contentitem where the amplitude changes drastically, i.e. where the amplitudechanges from a lower amplitude value to a considerably higher amplitudevalue within a predefined period of time.

In some embodiments, the method comprises dividing the audio contentitem into several equally-sized segments of predefined duration;comparing the audio patterns of said equally-sized segments of the audiocontent item; identifying those equally-sized segments that have same orsimilar audio patterns; grouping the equally-sized segments into groups,wherein each group comprises one or several equally-sized segmentshaving the same or similar audio pattern; for each group ofequally-sized segments, counting the number equally-sized segmentshaving the same or similar audio pattern; establishing the group thathas the highest number of equally-sized segments having the same orsimilar audio patterns; and interpreting the group having the highestnumber of equally-sized segments with the same or similar audio patternsto represent a most interesting part of the audio content item; whereinlocating said portion of the selected audio content item to be used asthe preview segment comprises locating any one of the segments of thegroup having the highest number of equally-sized segments and using thethus located segment as the preview segment. In one embodiment,comparing the audio patterns of said equally-sized segments of the audiocontent item comprises comparing amplitudes of said equally-sizedsegments of the audio content item; and identifying those equally-sizedsegments that have same or similar audio patterns comprises identifyingthose equally-sized segments that have same or similar amplitude values.

According to a second aspect, a computer server system is provided. Thecomputer server system is configured to perform, or otherwise execute,the method of the first aspect.

In some embodiments, the computer server system comprises one or severalcomputer servers, which include(s) means adapted to perform the methodof the first aspect.

In one example implementation, the computer server system comprises oneor several processing units adapted to perform the method of the firstaspect.

In another example implementation, the computer server system comprisesone or more processors; and memory storing one or more programs forexecution by the one or more processors, the one or more programsincluding instructions for performing the method of the first aspect.

According to a third aspect, a computer readable storage medium storingone or more programs is provided. The one or more programs comprisesinstructions, which, when executed by a computer server system havingone or several computer servers with one or more processors, cause thecomputer server system to perform the method of the first aspect.

According to a fourth aspect, a method performed by an electronic devicefor playback of an audio content item is provided. The method comprisesreceiving a first request to play a selected audio content item (e.g.,at a user interface of the electronic device); in response to receivingthe first request, transmitting a first data message comprisinginstructions to a computer server system to return a preview segmentassociated with the selected audio content item, the preview segmentbeing a portion of the selected audio content item; receiving anunencrypted preview segment from the computer server system; in responsethereto playing the unencrypted preview segment (e.g., at the userinterface of the electronic device); receiving a second request tocontinue playing the selected audio content item; in response toreceiving the second request, transmitting a second data messagecomprising instructions to the computer server system to return theselected audio content item; receiving the selected audio content itemas an encrypted audio content item; in response thereto decrypting thereceived audio content item; and playing the thus decrypted audiocontent item (e.g., at the user interface of the electronic device).

According to a fifth aspect, an electronic device is provided. Theelectronic device is configured to perform, or otherwise execute, themethod of the fourth aspect.

In some embodiments, the electronic device comprises means adapted toperform the method of the fourth aspect.

In one example implementation, the electronic device comprises anelectronic device, including a processing unit adapted to perform themethod of the fourth aspect.

In another example implementation, the electronic device comprises oneor more processors; and memory storing one or more programs forexecution by the one or more processors, the one or more programsincluding instructions for performing the method of the fourth aspect.

In some embodiments, the electronic device is a stationary electronicdevice, such as a stationary computer.

In other embodiments, the electronic device is a portable electronicdevice, such as a mobile telephone, a cellular telephone, a tabletcomputer, a laptop computer, a personal digital assistant.

According to a sixth aspect, a computer readable storage medium storingone or more programs is provided. The one or more programs comprisesinstructions, which, when executed by a computer server system havingone or several computer servers with one or more processors, cause thecomputer server system to perform the method of the first aspect.

Various embodiments described herein allow for quickly and efficientlybrowse, or scan through, a multitude of selectable audio content itemsat an electronic device by listening to shorter preview segments ofselected audio content items. At the same time, the various embodimentsdescribed herein allow for a sufficient protection against unauthorizeduse of the audio content provided by the content owners.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects, features and advantages will be apparent andelucidated from the following description of various embodiments,reference being made to the accompanying drawings, in which:

FIG. 1 illustrates a system for playback of video content, in accordancewith an embodiment;

FIG. 2 illustrates a flowchart of a method in accordance with anembodiment;

FIGS. 3A-3B illustrate flowcharts of a method in accordance with anembodiment;

FIG. 4 illustrates a flowchart of a method in accordance with anembodiment;

FIG. 5 schematically illustrates an example time-domain representationof a waveform of an audio content item;

FIG. 6 schematically illustrates an example time-domain representationof a waveform of an audio content item;

FIG. 7 illustrates a flowchart of a method in accordance with anembodiment;

FIG. 8 schematically illustrates an example time-domain representationof a waveform of an audio content item;

FIG. 9 illustrates a flowchart of a method in accordance with anembodiment;

FIGS. 10A-10C schematically illustrates an example embodiment of a userinterface of an electronic device, e.g. in the form of a tabletcomputer, which supports playback of an audio content item;

FIG. 11 illustrates a carrier containing a computer program, inaccordance with an embodiment;

FIG. 12 illustrates a carrier containing a computer program, inaccordance with another embodiment;

FIG. 13 illustrates an example implementation of an embodiment of acomputer server system in FIG. 1; and

FIG. 14 illustrates an example implementation of an embodiment of anelectronic device in FIG. 1.

DETAILED DESCRIPTION

The present invention will now be described more fully hereinafter. Theinvention may, however, be embodied in many different forms and shouldnot be construed as limited to the embodiments set forth herein; rather,these embodiments are provided by way of example so that this disclosurewill be thorough and complete, and will fully convey the scope of theinvention to those persons skilled in the art. Like reference numbersrefer to like elements or method steps throughout the description.

As described earlier, some existing solutions for playback of audiocontent items may be inadequate. It is a general object of theembodiments described herein to allow for an improved playback of audiocontent when the audio content is streamed to the electronic device.More particularly, embodiments disclosed herein addresses how to allowusers of electronic devices to quickly and efficiently browse, or scanthrough, a multitude of selectable audio content items while, at thesame time, allowing for a sufficient protection of the audio contentprovided by the content owners.

To address this, in accordance with an embodiment, described herein area method and a computer server system for streaming an audio contentitem to an electronic device. A first data message comprisinginstructions from an electronic device to return a preview segmentassociated with a selected audio content item is received from theelectronic device. In response, the selected audio content item isretrieved, or otherwise fetched, from a first storage. Also, audiocontent of the retrieved audio content item is analyzed in order tolocate a portion of the selected audio content item to be used as thepreview segment. Once located, this located portion of the selectedaudio content item is extracted from the retrieved audio content item.Subsequently, the extracted portion of the selected audio content itemis transmitted, i.e. sent, unencrypted to the electronic device

This way, the electronic device may receive an unencrypted previewsegment, which is a shorter preview version of the selected audiocontent item. This disclosure recognizes the fact that most contentowners would accept that shorter versions (e.g., in the form the previewsegments, or samples) of the entire content have comparatively lessprotection against unauthorized use for the benefit of giving the usersthe freedom of previewing a portion of the selected audio content item.Since the preview segments are received unencrypted, the electronicdevice does not need to decrypt the received preview segment. This maysave the resource usage (e.g., battery consumption, processor capacity,etc.) of the electronic device. Also, the provision of smallerunencrypted preview segments of the audio content items may allow for areduction in the required loading times for playback of preview segmentsand, simultaneously, allow for an uninterrupted user experience. Thedescribed approach also recognizes that the playback of a smallerunencrypted preview segment may have the psychological effect that theusers will perceive the playback of these smaller preview segments as ifthe smaller preview segment is being played back at the user interfaceimmediately. In other words, from the user's perception the playing backof the preview segments, i.e., the audio content item samples, seemsimmediate.

Furthermore, it is advantageous that the audio content of the retrievedaudio content item is analyzed in order to locate the portion of theselected audio content item that is to be used as the preview segment.For example, it may be possible to locate a portion the selected audiocontent item that is a good representation of the entire selected audiocontent item, or a portion which is represents an interesting portion ofthe selected audio content item. By locating a good representation ofthe entire selected audio content item, or a portion which represents aninteresting portion of the selected audio content item, a user'sbrowsing of a multitude of audio content items may be facilitated inthat the user may find what he or she is looking for quicker.

FIG. 1 illustrates an example environment where embodiments of thepresent invention may be applied. With continued reference to FIG. 1, anexample system 100 for playback of media content will therefore now bedescribed in further detail. The system 100 may comprise an electronicdevice 200 and a computer system 300 operating as a media server. Theelectronic device 200 may be communicatively connectable to the computersystem 300 via a network 400, such as the Internet, as is conventionaland known in the existing art. As can be seen in FIG. 1, only a singleelectronic device 200 and a single computer system 300 are shown.However, the computer system 300 may support the simultaneous use ofmultiple electronic devices, and/or the electronic device 200 cansimultaneously access media content at multiple computer systems.

In the following description and in order not to obscure the detaileddescription with unnecessary detail, the media content will generally beexemplified to be audio content, e.g. in form of music. This should,however, not be interpreted as limiting the scope of the variousembodiments of the disclosed embodiments.

As shown in FIG. 1, the electronic device 200 may be used for theplayback of audio content such as music, which is provided by thecomputer system 300. The electronic device 200 may be a mobiletelephone, such as a smart phone. Alternatively, the electronic device200 may be a tablet computer. In yet other embodiments, the electronicdevice 200 may be any other electronic device capable of playback ofmedia content such as, for example, one of the electronic devices of thefollowing group: a personal computer, a laptop, and a mobile electronicdevice (e.g. a handheld entertainment device, a digital media player, orother media device).

The electronic device 200 may include one or several physical computerresources, or hardware resources 210. The hardware resources 210 maye.g. include one or several processors (or, processing circuitry), acommunications interface (or, communication circuitry) and one orseveral memories. Likewise, the computer system 300 operating as a mediaserver may include one or several physical computer resources, orhardware resources 316. The hardware resources 316 may likewise includee.g. include one or several processors (or, processing circuitry), acommunications interface (or, communication circuitry) and one orseveral memories.

The computer system 300 may include an operating system or otherprocessing system which supports execution of a software application310, including a media server application 312 which may be used, forexample, to stream media content. A media stream service 318 may be usedto buffer media content, for streaming to one or more media streams 322,324, 326. A media application interface 314 may receive requests fromelectronic devices 200 or other systems, to retrieve media content 331from the computer system 300.

Media content 331, or media items, may be provided, for example, withina first storage such as a memory (e.g., including a database), or may bereceived by the computer system 300 from another source (not shown).This another source (not shown) could be external to the computer system300, i.e. it may be located remotely from the computer system 300.

A media streaming logic 330 may be used to retrieve or otherwise accessthe media content 331 in response to requests from electronic devices200 or other systems, and populate the media stream service with streams322, 324, 326 of corresponding media content data 323, 325, 327 that maybe returned, i.e. streamed, to the requesting electronic device 200.

The electronic device 200 comprises a user interface 230, which isadapted to display or otherwise provide a visual array of media options232, for example as a two-dimensional grid, a list, or other visualarray format, and determine a user input. Each media option in thevisual array of media options 232 correspond to a respective mediastream 322, 324, 326.

Selecting a particular media option within the visual array 232 may beused, or otherwise interpreted, as a request or instruction to the mediaserver application 312 to stream or otherwise return a correspondingparticular media content item. For example, in accordance with someembodiments, the software application 310 at the computer system 300 maybe used to stream or otherwise communicate media content to theelectronic device 200, wherein the user interface 230 at the electronicdevice 200 is adapted to display a plurality of media options thatcorrespond to respective media streams.

In accordance with some embodiments, the electronic device 200 may alsoinclude a media playback application 220, together with a playback logic222, pre-buffering logic 145, and a volume function 145, which may beused to control the playback of media content that is received from themedia server application 312, for playback by the electronic device 200,as described in further detail below.

A user 500 may interact 11 with the user interface 230 and issuerequests, for example the playing of a selected media option at theelectronic device 200. The user's selection of a particular media optionmay be communicated 12 to the media server application 312, via themedia application interface 314. The media server application 312 maythen be instructed 13 to stream corresponding media content, includingone or more streams of media content data 323, 325, 327, andsubsequently stream 14 or otherwise communicate the selected media tothe user's electronic device 200. In accordance with some embodiments,pre-buffering requests from the electronic device 200 may also becommunicated 12 to the media server application 312 via the mediaapplication interface 314. At the electronic device 200, in response tothe user's interaction with the user interface 230, the media playbackapplication 220, including the playback logic 222, may play 10 therequested media content to the user 500.

FIG. 2 illustrates an example embodiment of a method for streaming anaudio content item to an electronic device 200. The method may beperformed by, or otherwise executed in, a computer server system 300(see FIG. 1). In some embodiments, the computer server system isimplemented by one single computer server. In other embodiments, thecomputer server system is implemented by two or more computer servers,i.e. the method is performed by several computer servers in adistributed manner.

As can be seen in FIG. 2, a first data message is received 210, orotherwise obtained. This first data message comprises instructions fromthe electronic device 200 to return a preview segment associated with aselected audio content item. The preview segment is a portion, or part,of the selected audio content item. The preview segment can thus beregarded as a sample of the selected audio content item.

Upon receipt of the first data message, the selected audio content itemis retrieved 220 from a first storage 331, e.g. a memory. The firststorage may be an internal storage of the computer server system 300.Alternatively, the first storage may be an external storage, which isaccessible by the computer server system 300.

Advantageously, but not necessarily, retrieving 220 the selected audiocontent item from the first storage may comprise retrieving the entireselected audio content item from the first storage.

Once retrieved 220, the audio content of the retrieved audio contentitem is analyzed 230 in order to locate a portion of the selected audiocontent item to be used as the preview segment. In other words, theportion to be used as the preview segment, or sample, is located on thebasis of an audio analysis of the retrieved audio content item. Thisaudio analysis may be performed in many different ways. Some exampleswill be explained in further detail herein below.

In some embodiments, only a portion (e.g., a predefined portion) of theretrieved audio content item is analyzed. That is, it is not necessaryto analyze the audio pattern of the entire selected audio content item.In one embodiment, this portion of the retrieved audio content item is aportion having a predefined duration. The predefined duration may, forexample, be 5 seconds, 10 seconds, 15, seconds, 20 seconds, 30 seconds,60 seconds or 90 seconds. In some embodiments this portion is a portionat the beginning of the retrieved audio content item such as, e.g., theinitial 30 seconds of the audio content item.

After the portion to be used as the preview segment has been located220, or identified, this located portion of the selected audio contentitem is extracted 240 from the retrieved audio content item.

Following the extraction 240 of the located portion, this extractedportion of the audio content item can be transmitted, e.g. streamed,unencrypted to the requesting electronic device.

Hereby it is made possible for the electronic device 200 to receive anunencrypted preview segment, which is a shorter preview version of theselected audio content item. Since the preview segments are receivedunencrypted, the electronic device 200 does not need to decrypt thereceived preview segment. This may save the resource usage (e.g.,battery consumption, processor capacity, etc.) of the electronic device200. Furthermore, it is advantageous that the audio content of theretrieved audio content item is analyzed in order to locate a portion ofthe selected audio content item to be used as the preview segment. Forexample, it may be possible to locate a portion the selected audiocontent item that is a good representation of the entire selected audiocontent item, or a portion which represents an interesting portion ofthe selected audio content item. By locating a good representation ofthe entire selected audio content item, or a portion which represents aninteresting portion of the selected audio content item, a user'sbrowsing of a multitude of audio content items may be facilitated inthat the user may find what he or she is looking for quicker.

With continued reference to FIG. 2, upon a user's further selection atthe electronic device 200 to play the entire selected audio contentitem, the method may additionally comprise receiving 260 a second datamessage including instructions from the electronic device 200 to returnthe entire selected audio content item. In response to receiving 260, orotherwise obtaining, the second data message, the entire selected audiocontent item can be retrieved 270 from a second storage. In someembodiments, the first storage and the second storage are the samestorage. In alternative embodiments, the first storage and the secondstorage are different storages located separately from each other.Furthermore, the entire retrieved audio content item is encrypted 280.Once encrypted, the encrypted audio content item can be transmitted 290,e.g. streamed, to the requesting electronic device.

It should be appreciated that, in some embodiments, where the method ofFIG. 2 is implemented in a distributed computer server system solution,a first computer server may be configured to perform, or otherwiseexecute, the actions 210 through 250, whereas a second computer servermay be configured to perform, or otherwise execute, the actions 260through 290. Thus, the first computer server may for example be adedicated server which is dedicated to provide smaller unencryptedportions, i.e. preview segments, to requesting electronic devices 200.Also, the second computer server may for example be a dedicated serverwhich is dedicated to provide the entire selected audio content items tothe requesting electronic device 200 upon a user's further selection toplay the whole content of the selected audio content item. A distributedcomputer server system solution may have the advantage of task sharingamong the different computer servers that are involved such that thedifferent computer servers perform different actions, or method steps,of the method shown in FIG. 2.

FIGS. 3A-3B illustrate another example embodiment of a method forstreaming an audio content item to an electronic device. Those methodsteps, or actions, that are the same or similar as in the embodimentshown in FIG. 2 will not be repeated here. As can be seen in FIG. 3A,the method may further comprise partially encrypting 310 the selectedaudio content item. As can be seen in FIG. 3B, partially encrypting 310the selected audio content item may comprise encrypting 311 anunextracted portion of the audio content item (i.e., the remainingportion, or part, of the audio content item after the located portionhaving been extracted 240), and leaving 312 the extracted portion of theselected audio content item unencrypted. In FIG. 3B, the actions, ormethod steps, 311 and 312, respectively, are schematically illustratedin a certain order. It will be appreciated that the reverse order isequally possible, i.e. the extracted portion of the selected audiocontent item is left 312 unencrypted first and, subsequently, theunextracted portion is encrypted 311. In response to the selected audiocontent item having been partially decrypted, the partially encryptedaudio content item can be transmitted 320, e.g. streamed, to therequesting electronic device.

A partial encryption of the audio data stream can thus be provided suchthat certain content (i.e., the unextracted portion) of the audiocontent item is encrypted, while other content (i.e., the smallerextracted portion) remains unencrypted so that access to, for example,the unencrypted portion of the audio content item can be providedwithout compromising protection of the remaining portion of the audiocontent item. In other words, a selective partial encryption of theaudio content item can be provided. Hereby it is made possible for theelectronic device to receive the unencrypted preview segment as well asa remaining encrypted portion of the selected audio content item atonce. Since the preview segments are received unencrypted, theelectronic device does not need to decrypt this portion of the selectedaudio content item. This may save the resource usage (e.g., batteryconsumption, processor capacity, etc.) of the electronic device whenplaying the preview segments of a selected audio content item. Also, itis not necessary for the electronic device to begin decrypting theencrypted portion of the received audio content item until theelectronic device receives an instruction, or otherwise recognizes, thatthe user wishes to play the entire selected audio content item.

Turning now to FIGS. 4 and 5, respectively, an example procedure foranalyzing 230 (see FIGS. 2 and 3A) the audio content of the retrievedaudio content item to locate the portion of the selected audio contentitem to be used as the preview segment will be described in some moredetail.

FIG. 4 schematically illustrates an example procedure of analyzing audiocontent of the retrieved audio content item. The audio pattern of theaudio content item is evaluated 231. Subsequently, the portion of theselected audio content item that is to be used as the preview segment islocated 232, thus identified, based on the evaluation of the audiopattern. For example, in one embodiment, amplitude variations of theaudio content item are evaluated 231. If so, the portion of the selectedaudio content item that is to be used as the preview segment is located232, thus identified, based on the evaluation of amplitude variations.

FIG. 5 schematically illustrates an example of a time-domainillustration 500 of a waveform of an audio content item in the form of asong. A time-domain illustration, or representation, of the audiocontent item can illustrate the amplitude variations of the audiocontent item at different points in time. Assume that a selected audiocontent item has an audio pattern 510, as is illustrated in FIG. 5. Theamplitude variations of the audio content item, in this example anexemplary song, can be evaluated 231. Based on the evaluation 231, it ispossible to select which portion of the audio content item that is to beused as the preview segment (that is to be extracted 240 from the audiocontent item in a subsequent method step, or action). This approachrecognizes the fact that many songs show an amplitude variationcharacteristic where the amplitude variations increase from a relativelylow level to a comparatively much higher level. For example, withcontinued reference to FIG. 5, it is possible to establish, or otherwiseconclude, that the amplitude variations increase at a time t1, or morespecifically slightly after t1. This point in time, i.e. t1, may then beused, or otherwise, interpreted by the computer server system toindicate a starting point of the portion that will be used as thepreview segment. In other words, an increase of amplitude variations maybe used to locate a starting point of the portion 511 that will be usedas the preview segment. Once the starting point t1 has been located,thus identified, it is possible to establish the ending time of theportion 511 that will be used as the preview segment. This ending timeof said portion 511 may be selected to be at a time t2. The time t2 may,for example, be selected such that the period of time between t2 and t1(i.e., Δt=t2−t1) has a predefined duration, e.g. 5 seconds, 10 seconds,15, seconds, 20 seconds, 30 seconds, 60 seconds or 90 seconds. Inalternative embodiments, Δt has no predefined duration. Rather, thepoint of time t2 may for example be selected to be at a different time,e.g. where the amplitude variations begin to decrease after a precedingincrease.

Another embodiment, which will be described in connection with FIG. 4and FIG. 6, includes evaluating 231 amplitude variations 610 of theaudio content item only for a pre-defined duration (here exemplified byΔt=t4−t3) at the beginning of the audio content item. For example, thepre-defined duration at the beginning of the audio content item may be 5seconds, 10 seconds, 15, seconds, 20 seconds, 30 seconds, 60 seconds or90 seconds. Furthermore, the portion 611 of the selected audio contentitem to be used as the preview segment can be located (within Δt=t4−t3)by identifying a location 612 of the audio content item where theamplitude changes drastically, i.e. a location where the amplitudechanges from a lower amplitude value to a considerably higher amplitudevalue within a predefined period of time, which predefined period oftime is typically relatively short such as 0.2 seconds, 0.5 seconds, 1second, 2 seconds or 5 seconds. This location 612, may then be used, orotherwise, interpreted by the computer server system to indicate astarting point of the portion 611 that will be used as the previewsegment. In other words, a drastic amplitude change may be used, orotherwise interpreted, by the computer server system to locate astarting point of the portion 611 that will be used as the previewsegment. Once the starting point 612 has been located, thus identified,it is possible to establish the ending time of the portion 611 that willbe used as the preview segment. This ending time of said portion 611 maybe selected to be at a location 613. The ending time 613 may, forexample, be selected such that the period of time between starting time612 and the ending time 613 has a predefined duration, e.g. 5 seconds,10 seconds, 15, seconds, 20 seconds, 30 seconds, 60 seconds or 90seconds. In alternative embodiments, the period of time between startingtime 612 and the ending time 613 has no predefined duration. Rather, theending time 613 may for example be selected to be at a different time,e.g. when another drastic amplitude change occurs and is detected.

Turning now to FIGS. 7 and 8, respectively, still another exampleprocedure of analyzing 230 audio content of the retrieved audio contentitem will be described. As is illustrated in FIG. 7, a selected audiocontent item can be divided 710 into several equally-sized segments811-819 of predefined duration. The pre-defined duration may for examplebe 5 seconds, 10 seconds, or 15 seconds, 20 seconds, 30 seconds, 60seconds, or 90 seconds. The audio patterns of the segments 811-819 canbe compared 720. In some embodiments, the comparison 720 comprisescomparing amplitudes of the segments of the audio content item.

Furthermore, those segments that have the same or similar audio patternscan be identified 730. In some embodiments, this identification 730comprises identifying those equally-sized segments that have same orsimilar amplitude values. For example, in the example shown in FIG. 8,segments 813, 816 and 817 may be said to have similar audio patterns.Likewise, segments 814 and 815 may be said to have similar audiopatterns. The remaining segments have audio patterns that are notnecessarily common, or similar, with other segments.

Once identified 730, the segments 811-819 can be grouped into groupsbased on the similarity of audio patterns. In other words, the segmentsmay be grouped into audio pattern groups, wherein each audio patterngroup comprises one or several equally-sized segments having the same orsimilar audio pattern. Table 1 herein below shows one example tablewhere the segments of FIG. 8 are grouped into different audio patterngroups A through F, e.g. in a look-up table.

TABLE 1 Example grouping of segments. Audio pattern group Segments A 811B 812 C 813, 816, 817 D 814, 815 E 818 F 819

Moreover, for each group of the audio pattern groups A-F, the number ofsegments can be counted 750. Continuing with the example of Table 1,Table 2 illustrates the number of segments for each audio pattern group.

TABLE 2 Number of segments in each group. Audio pattern group SegmentsNumber of segments A 811 1 B 812 1 C 813, 816, 817 3 D 814, 815 2 E 8181 F 819 1

Based on the counting 750, it is further possible to establish 760, orotherwise conclude, which of the audio patterns group A-F that has thehighest number of segments with the same or similar audio patterns. Inthe example shown in Table 2, group C has the highest number of segmentswith the same or similar audio patterns. Next, the group having thehighest number of segments with the same or similar audio patterns(i.e., group C in this example) is interpreted 770 to represent a mostinteresting part of the audio content item. According to someembodiments, in the event that more than one group have the highest(and, thus, the same) number of segments with the same or similar audiopatterns, one of the groups may be randomly selected and interpreted 770to represent a most interesting part of the audio content item.According to other embodiments, in the event that more than one grouphave the highest (and the same) number of segments with the same orsimilar audio patterns, a further audio analysis may be performed forthe segments of those groups. Based on this further audio analysis, oneof the groups may be selected and interpreted 770 to represent a mostinteresting part of the audio content item. For instance, a groupincluding segments that show the highest amplitude variations could beselected in favor of other groups. This is only a mere example. Thoseskilled in the art would realize that other criteria are alsoconceivable.

Locating 230 the portion of the selected audio content item to be usedas the preview segment may then comprise locating any one of thesegments of the group having the highest number of segments (i.e., groupC in this example) and using the thus located segment as the previewsegment. For example, in the example hereinabove, it would be possibleto find the segments 813, 816 and 817 of group C in the look-up tablethat is schematically illustrated in Table 1 hereinabove. Next, one ofthese found segments 813, 816, 817 is selected, and subsequently, usedas the preview segment. The selection of one of the segments 813, 816,817 may be made randomly. Alternatively, in other embodiments, it ispossible to perform an audio analysis of neighboring segments (i.e.,segments 812 and 814 neighboring segment 813, segments 815 and 817neighboring segment 816, and segments 816 and 818 neighboring segment817) and utilize this further audio analysis for the selection of one ofthe segments in said group (i.e., group C in this example).

With reference to FIG. 9 and FIG. 10A-C, respectively, an exampleembodiment of a method for playback of an audio content item will bedescribed. FIG. 9 illustrates a flowchart of the method according to anembodiment and FIG. 10 illustrate an example of a user interface 230 ofthe electronic device 200, which supports playback of the audio contentitem in accordance with said embodiment. The electronic device 200 whichis schematically illustrated in FIG. 10 hence comprises a user interface230.

The user interface 230 typically includes output device(s) and inputdevice(s), as is known and conventional in the art. In someimplementations, the input devices may include a keyboard, a mouse or atrack pad. Alternatively, or in addition, in some implementations, theuser interface 230 includes a display that includes a touch-sensitivesurface, in which case the display is a touch-sensitive display. Thetouch-sensitive display is adapted to detect or otherwise determine auser input. In electronic devices 200 that have a touch-sensitivedisplay, a soft keyboard may be displayed when keyboard entry is needed.A soft keyboard is a keyboard that replaces the physical keyboard onelectronic devices 200 having touch-sensitive displays. Hence, inelectronic devices 200 that have a touch-sensitive display a physicalkeyboard is optional. The output devices may for example include one ormore speakers and/or one or more audio output connections for connectingto external speaker(s), headphones or earphones. Optionally, the inputdevices may further include an audio input device (e.g., a microphone)to capture audio (e.g., speech). Still further, the input devices mayalso optionally comprise audio recognition device(s) to recognize audio(e.g., speech), which in combination with a microphone, may for examplesupplement or replace the keyboard.

As is schematically illustrated in FIG. 10, the user interface 230includes a display, which is adapted to display or otherwise provide avisual array of media options A-O (601-615), for example as atwo-dimensional grid, a list, or other visual array format. As is alsoschematically illustrated in FIG. 10, the plurality of media options A-Omay for example be displayed as an array of image tiles 650. An imagetile 650 may be embodied as a card at the display. For example, a cardmay include an image, which is related to the media option in question.An example of such an image could be an album cover or the like. Eachimage tile 650 may further include metadata related to the media optionin question. This metadata may thus comprise information or data aboutthe media option in question. As such, the metadata may includeinformation such as genre, artist, title of the song, etcetera.

In this example, each media option A-O in the visual array of mediaoptions correspond to a respective audio content item, e.g. a song. Eachaudio content item may be provided to the electronic device in the formof an audio stream. In other words, each media option A-O in the visualarray of media options can be said to correspond to a respective audiocontent item, which in turn correspond to a respective audio stream 322,324, 326 (see FIG. 1).

Turning now to FIG. 10B, a first request to playback a selected audiocontent item (in this example the audio content item corresponding tomedia option L) is received 910 (see FIG. 9). For example, in oneembodiment, upon the user interface 230 of the electronic device 200detecting a hovering gesture over the display area corresponding to theimage tile associated with the selected audio content item, theelectronic device 200 receives this first request to playback a selectedaudio content item. In response to receiving 910 the first request, theelectronic device transmits 920, i.e. sends, a first data messagecomprising instructions to a computer server system to return a previewsegment associated with the selected audio content item. As describedearlier, this preview segment is a portion, or sample, from the selectedaudio content item, i.e. in this example media option L. Furthermore,the electronic device 200 receives 930 an unencrypted preview segment.In response thereto, the thus received unencrypted preview segment isplayed 940 at the user interface (e.g., through speaker(s) thereof).

Furthermore, the electronic device 200 may receive a second request,i.e. a new request, to continue playing the selected audio content item.For example, in one embodiment, upon a press gesture, or a tap gesture,within the display area corresponding to the earlier-mentioned selectedimage tile corresponding to media option L, the electronic device 200receives the second request, or instruction, to play the entire audiocontent item associated with this selection. In response to receiving950 the second request, the electronic device 200 transmits a seconddata message comprising instructions to the computer server system toreturn the selected audio content item, i.e. the entire selected audiocontent item. In response thereto, the electronic device 200 may furtherreceive 960 the selected audio content item as an encrypted audiocontent item. Upon receiving 960 the audio content item, the electronicdevice decrypts 970 the received audio content item and, also, plays 980the thus decrypted audio content item at the user interface (e.g.,through speaker(s) thereof) of the electronic device 200.

The above example exemplifies that the selected audio content item(and/or the preview segment thereof) is played at the user interface 230of the electronic device 200. In alternative embodiments, the electronicdevice 200 is further capable of remotely controlling one or more mediapresentation systems (not shown), such as one or several loudspeakers.To this end, the electronic device 200 may for example implement, orotherwise utilize, any of the techniques described in the internationalpatent application PCT/I B2013/001938 (published under WO 2014/001913A2) or in U.S. Patent Application Publication No. 2014/0006483 A1, eachof which are herein incorporated by reference. For example, it is thuspossible for a user of the electronic device 200 to remotely control theplayback of selected audio content items (and/or preview segmentsthereof) through external loudspeakers. More specifically, in someembodiments, the electronic device may receive a media control commandfor a loudspeaker(s). In response to receiving this media controlcommand, the electronic device 200 may send a server media controlrequest to the computer server 300 and a local media control request tothe loudspeaker(s), which may located be within the same local networkas the electronic device 200 (i.e., a local network to which both theelectronic device 200 and the loudspeaker(s) are connected). The servermedia control request may e.g. be sent to the computer server 300 overthe Internet. Typically, but not necessarily, the computer server 300 isassociated with an Internet Protocol (IP) address outside the space ofthe local network to which both the electronic device 200 and theloudspeaker(s) are connected. As will be appreciated, the electronicdevice 200 and the loudspeaker(s) can thus be associated with IPaddresses within the same sub network. The electronic device 200 mayhence provide a user interface 230 that allows a user 600 to operate theelectronic device 200 and to select audio content items (such as songs)for presentation, thus playback, by the electronic device 200 itselfand, also, to generate media control request(s) to cause the audiocontent items to be presented, or played, by the loudspeaker(s).Furthermore, the server media request and the local media request areboth configured to cause a media control operation, performed at theelectronic device 200, to be implemented at the loudspeakers, e.g. inaccordance with the teaching of the international patent applicationPCT/IB2013/001938 and U.S. Patent Application Publication No.2014/0006483 A1.

Turning now to FIG. 11, another embodiment will be briefly discussed.FIG. 11 shows an example of a computer-readable medium, in this examplein the form of a data disc 1100. In one embodiment the data disc 1100 isa magnetic data storage disc. The data disc 1100 is configured to carryinstructions 1101 that can be loaded into a memory 316B of a computerserver system 300. Upon execution of said instructions by a processor316A of the computer server system 300, the computer server system 300is caused to execute a method or procedure according to any one of theembodiments described herein in conjunction with FIGS. 2 through 8. Thedata disc 1100 is arranged to be connected to or within and read by areading device (not shown), for loading the instructions into theprocessor. One such example of a reading device in combination with one(or several) data disc(s) 1100 is a hard drive. It should be noted thatthe computer-readable medium can also be other mediums such as compactdiscs, digital video discs, flash memories or other memory technologiescommonly used. In such an embodiment the data disc 1100 is one type of atangible computer-readable medium. The instructions may alternatively bedownloaded to a computer data reading device, such as a computer serversystem 300 capable of reading computer coded data on a computer-readablemedium, by comprising the instructions in a computer-readable signal(not shown) which is transmitted via a wireless (or wired) interface(for example via the Internet) to the computer data reading device forloading the instructions into a processor 316A of the computer serversystem 300. In such an embodiment, the computer-readable signal is onetype of a non-tangible computer-readable medium.

Turning now to FIG. 12, still another embodiment will be brieflydiscussed. FIG. 12 shows an example of a computer-readable medium, inthis example in the form of a data disc 1200. In one embodiment the datadisc 1200 is a magnetic data storage disc. The data disc 1200 isconfigured to carry instructions 1201 that can be loaded into a memory210B of an electronic device 200. Upon execution of said instructions bya processor 210A of the electronic device 200, the electronic device 200is caused to execute a method or procedure according to any one of theembodiments described herein in conjunction with FIGS. 9-10. The datadisc 1200 is arranged to be connected to or within and read by a readingdevice (not shown), for loading the instructions into the processor. Onesuch example of a reading device in combination with one (or several)data disc(s) 1200 is a hard drive. It should be noted that thecomputer-readable medium can also be other mediums such as compactdiscs, digital video discs, flash memories or other memory technologiescommonly used. In such an embodiment the data disc 1200 is one type of atangible computer-readable medium. The instructions may alternatively bedownloaded to a computer data reading device, such as an electronicdevice 200 capable of reading computer coded data on a computer-readablemedium, by comprising the instructions in a computer-readable signal(not shown) which is transmitted via a wireless (or wired) interface(for example via the Internet) to the computer data reading device forloading the instructions into a processor 210A of the electronic device200. In such an embodiment, the computer-readable signal is one type ofa non-tangible computer-readable medium.

With reference to FIG. 13, an example implementation of the computerserver system 300 of FIG. 1 will be described in some further detail.For example, the computer server system 300 shown in FIG. 1 may compriseone or several computer servers, as described earlier. Furthermore, thecomputer server system 300 may comprise means adapted to perform themethod described herein with reference to FIGS. 2-8. In one embodiment,the computer server system 300 thus comprises means adapted to receive afirst data message comprising instructions from an electronic device toreturn a preview segment associated with a selected audio content item,the preview segment being a portion of the selected audio content item;means adapted to retrieve said selected audio content item from a firststorage; means adapted to analyze audio content of the retrieved audiocontent item to locate a portion of the selected audio content item tobe used as the preview segment; means adapted to extract the locatedportion of the selected audio content item from the retrieved audiocontent item; and means adapted to transmit the extracted portion of theselected audio content item unencrypted to the electronic device.

Furthermore, the computer server system 300 may comprise means adaptedto partially encrypt the selected audio content item by encrypting anunextracted portion of the audio content item and by leaving theextracted portion of the selected audio content item unencrypted. Forexample, the computer server system 300 may also comprise means adaptedto transmit the partially encrypted audio content item to the electronicdevice.

Still further, the computer server system 300 may comprise means adaptedto receive a second data message including instructions from theelectronic device to return the entire selected audio content item;means adapted to retrieve the entire selected audio content item from asecond storage; means adapted to encrypt the entire retrieved audiocontent item; and means adapted to transmit the encrypted audio contentitem to the electronic device.

Moreover, the computer server system 300 may comprise means adapted toevaluate an audio pattern of the audio content item; and means adaptedto locate said portion of the selected audio content item to be used asthe preview segment based on the evaluation of the audio pattern. Forexample, the computer server system 300 may comprise means adapted toevaluate amplitude variations of the audio content item; and meansadapted to locate said portion of the selected audio content item to beused as the preview segment based on the evaluation of the amplitudevariations. In one example embodiment, the computer server system 300comprises means adapted to evaluate amplitude variations of the audiocontent item only for a pre-defined duration at the beginning of theaudio content item; and means adapted to locate said portion of theselected audio content item to be used as the preview segment byidentifying a location of the audio content item where the amplitudechanges drastically, i.e. where the amplitude changes from a loweramplitude value to a considerably higher amplitude value within apredefined period of time.

In yet another embodiment, the computer server system 300 comprisesmeans adapted to divide the audio content item into severalequally-sized segments of predefined duration; means adapted to comparethe audio patterns of said equally-sized segments of the audio contentitem; means adapted to identify those equally-sized segments that havesame or similar audio patterns; means adapted to group the equally-sizedsegments into groups, wherein each group comprises one or severalequally-sized segments having the same or similar audio pattern; meansadapted to count (for each group of equally-sized segments) the numberequally-sized segments having the same or similar audio pattern; meansadapted to establish the group that has the highest number ofequally-sized segments having the same or similar audio patterns; andmeans adapted to interpret the group having the highest number ofequally-sized segments with the same or similar audio patterns torepresent a most interesting part of the audio content item. Also, thecomputer server system 300 may comprise means adapted to locate any oneof the segments of the group having the highest number of equally-sizedsegments and use, or otherwise utilize, the thus located segment as thepreview segment. Still further, the computer server system 300 maycomprise means adapted to compare amplitudes of said equally-sizedsegments of the audio content item; and means adapted to identify thoseequally-sized segments that have same or similar amplitude values.

FIG. 13 schematically illustrates one example implementation of acomputer server system, here exemplified by a single computer server inorder to ease the understanding of the disclosure. The computer server300 shown in FIG. 13 is configured to execute, or otherwise perform, themethods described throughout this disclosure with reference to FIGS.2-8. As is schematically illustrated in FIG. 13, the computer server 300comprises hardware 316. For example, the computer server 300 maycomprise one or more processors 316A and one or more memories 316B.Also, a communications interface 316C, or a communications circuitry,may be provided in order to allow the computer server 300 to communicatewith electronic devices 200 and/or other servers 300, e.g. via a network400 such as the Internet. To this end, the communications interface 316Cmay comprise a transmitter (Tx) and a receiver (Rx). Alternatively, thecommunications interface 316C may comprise a transceiver (Tx/Rx)combining both transmission and reception capabilities. Thecommunications interface 316C may include a radio frequency (RF)interface allowing the computer server 300 to communicate withelectronic devices 200 and/or other servers 300 through a radiofrequency band through the use of different radio frequency technologiessuch as LTE (Long Term Evolution), WCDMA (Wideband Code DivisionMultiple Access), any other cellular network standardized by the 3rdGeneration Partnership Project (3GPP), or any other wireless technologysuch as Wi-Fi, Bluetooth®, etcetera. As described with reference to FIG.1, the computer server 300 may also comprise one or more applications,e.g. the software application 310 including the media server application312. The applications are sets of instructions (e.g., computer programcode) that when executed by the one or more processors 316A controls theoperation of the computer server 300.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server to: receive, via the communications interface 316C,a first data message comprising instructions from an electronic deviceto return a preview segment associated with a selected audio contentitem, the preview segment being a portion of the selected audio contentitem; retrieve said selected audio content item from a first storage;analyze audio content of the retrieved audio content item to locate aportion of the selected audio content item to be used as the previewsegment; extract the located portion of the selected audio content itemfrom the retrieved audio content item; and transmit, via thecommunications interface 316C, the extracted portion of the selectedaudio content item unencrypted to the electronic device.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to retrieve the entire selected audio contentitem from the first storage.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to partially encrypt the selected audio contentitem by encrypting an unextracted portion of the audio content item; andleaving the extracted portion of the selected audio content itemunencrypted.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to transmit, via the communications interface316C, the partially encrypted audio content item to the electronicdevice.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to receive, via the communications interface316C, a second data message including instructions from the electronicdevice to return the entire selected audio content item; retrieve theentire selected audio content item from a second storage; encrypt theentire retrieved audio content item; and transmit, via thecommunications interface 316C, the encrypted audio content item to theelectronic device.

In some example implementations, the first storage and the secondstorage are the same storage.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to analyze the audio content from only a portionof the retrieved audio content item. For example, said portion of theretrieved audio content item comprises a portion having a predefinedduration. This predefined duration may for example be 30 seconds, 60seconds or 90 seconds. In some implementations, said portion is aportion at the beginning of the retrieved audio content item.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to evaluate an audio pattern of the audiocontent item; and locate said portion of the selected audio content itemto be used as the preview segment based on the evaluation of the audiopattern. For example, in some implementations, the one or more memories316B stores computer program code, which, when run in the one or moreprocessors 316A causes the computer server 300 to evaluate amplitudevariations of the audio content item; and locate said portion of theselected audio content item to be used as the preview segment based onthe evaluation of the amplitude variations.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to evaluate amplitude variations of the audiocontent item only for a pre-defined duration at the beginning of theaudio content item; and locate said portion of the selected audiocontent item to be used as the preview segment by identifying a locationof the audio content item where the amplitude changes drastically, i.e.,where the amplitude changes from a lower amplitude value to aconsiderably higher amplitude value within a predefined period of time.

In some implementations, the one or more memories 316B stores computerprogram code, which, when run in the one or more processors 316A causesthe computer server 300 to divide the audio content item into severalequally-sized segments of predefined duration; compare the audiopatterns of said equally-sized segments of the audio content item;identify those equally-sized segments that have same or similar audiopatterns; group the equally-sized segments into groups, wherein eachgroup comprises one or several equally-sized segments having the same orsimilar audio pattern; for each group of equally-sized segments, countthe number equally-sized segments having the same or similar audiopattern; establish the group that has the highest number ofequally-sized segments having the same or similar audio patterns;interpret the group having the highest number of equally-sized segmentswith the same or similar audio patterns to represent a most interestingpart of the audio content item; and locate any one of the segments ofthe group having the highest number of equally-sized segments andutilize the thus located segment as the preview segment. In someimplementations, the one or more memories 316B stores computer programcode, which, when run in the one or more processors 316A causes thecomputer server 300 to compare amplitudes of said equally-sized segmentsof the audio content item; and identify those equally-sized segmentsthat have same or similar amplitude values.

With reference to FIG. 14, an example implementation of the electronicdevice of FIG. 1 will be described in some further detail. For example,electronic device may be implemented as a stationary electronic device,such as a stationary computer. Alternatively, the electronic device 200may be embodied as a portable electronic device, such as a mobiletelephone, a cellular telephone, a tablet computer, a laptop computer,or a personal digital assistant. In some embodiments, the electronicdevice 200 may comprise means adapted to perform the method describedherein with reference to FIGS. 9-10. In one embodiment, the electronicdevice 200 thus comprises means adapted to receive a first request toplay a selected audio content item (e.g., at a user interface of theelectronic device), means adapted to transmit a first data messagecomprising instructions to a computer server system to return a previewsegment associated with the selected audio content item, the previewsegment being a portion of the selected audio content item; meansadapted to receive an unencrypted preview segment from the computerserver system; means adapted to play the unencrypted preview segment(e.g., at the user interface of the electronic device); means adapted toreceive a second request to continue playing the selected audio contentitem; means adapted to transmit a second data message comprisinginstructions to the computer server system to return the selected audiocontent item; means adapted to receive the selected audio content itemas an encrypted audio content item; means adapted to decrypt thereceived audio content item; and means adapted to play the thusdecrypted audio content item (e.g., at the user interface of theelectronic device).

FIG. 14 illustrates an example implementation of the electronic device200, which is suitable for playback of an audio content item, e.g. asong or the like. The electronic device 200 is configured to execute, orotherwise perform, the method described with respect to. As isschematically illustrated in FIG. 14, the electronic device 200comprises hardware 210A-C. For example, the electronic device 200 maycomprise one or more processors 210A and one or more memories 210B.Also, a communications interface 210C may be provided in order to allowthe electronic device 200 to communicate with other electronic devicesand/or servers 300, e.g. via a network 400 such as the Internet. To thisend, the communications interface 210C may comprise a transmitter (Tx)and a receiver (Rx). Alternatively, the communications interface 210Cmay comprise a transceiver (Tx/Rx) combining both transmission andreception capabilities. The communications interface 210C may include aradio frequency (RF) interface allowing the electronic device 200 tocommunicate with other devices and/or servers 300 through a radiofrequency band through the use of different radio frequency technologiessuch as LTE (Long Term Evolution), WCDMA (Wideband Code DivisionMultiple Access), any other cellular network standardized by the 3rdGeneration Partnership Project (3GPP), or any other wireless technologysuch as Wi-Fi, Bluetooth®, etcetera. The electronic device 200 mayfurther comprise a user interface 230, as described earlier herein.Hence, the user interface 230 may advantageously include atouch-sensitive display. As such, the touch-sensitive display may be atouch screen display upon which virtual keys may be displayed andoperated. Furthermore, the user interface 230 may include output meanssuch as loudspeakers (not shown). As described with reference to FIG. 1,the electronic device 200 may comprise one or more applications, e.g.the media playback application 220. The applications are sets ofinstructions (e.g., computer program code) that when executed by the oneor more processors 210A controls the operation of the electronic device200. In some implementations, the one or more memories 210B storescomputer program code, which, when run in the one or more processors210A causes the electronic device 200 to receive a first request to playa selected audio content item (e.g., at a user interface of theelectronic device); in response to receiving the first request,transmit, via the communications interface 210C, a first data messagecomprising instructions to a computer server system to return a previewsegment associated with the selected audio content item, the previewsegment being a portion of the selected audio content item; receive, viathe communications interface 210C, an unencrypted preview segment fromthe computer server system; in response thereto play the unencryptedpreview segment (e.g., at the user interface such as via a loudspeaker)of the electronic device; receive a second request to play the selectedaudio content item; in response to receiving the second request,transmit, via the communications interface 210C, a second data messagecomprising instructions to the computer server system to return theselected audio content item; receive the selected audio content item asan encrypted audio content item; in response thereto, decrypt thereceived audio content item; and playing the thus decrypted audiocontent item (e.g., at the user interface of the electronic device suchas via a loudspeaker).

The various embodiments described in this disclosure allow an electronicdevice 200 to receive an unencrypted preview segment, which is a shorterpreview version of the selected audio content item. This disclosurerecognizes the fact that most content owners would accept that shorterversions (e.g., in the form the preview segments, or samples) of theentire content have comparatively less protection against unauthorizeduse for the benefit of giving the users the freedom of previewing aportion of the selected audio content item. Since the preview segmentsare received unencrypted, an electronic device 200 does not need todecrypt the received preview segment. This may save the resource usagesuch as battery consumption and/or processor usage of the electronicdevice 200. Also, the provision of smaller unencrypted preview segmentsof the audio content items may allow for a reduction in the requiredloading times for playback preview segments and, simultaneously, allowfor an uninterrupted user experience. The described approach alsorecognizes that the playback of a smaller unencrypted preview segmentmay have the psychological effect that the users will perceive theplayback of these smaller preview segments as if the smaller previewsegment is being played back at the user interface immediately. In otherwords, from the user's perception the playing back of the previewsegments, i.e., the audio content item samples, seems immediate.Furthermore, it is advantageous that the audio content of the retrievedaudio content item is analyzed in order to locate a portion of theselected audio content item to be used as the preview segment. Forexample, it may be possible to locate a portion of the selected audiocontent item that is a good representation of the entire selected audiocontent item, or a portion which is represents an interesting portion ofthe selected audio content item. By locating a good representation ofthe entire selected audio content item, or a portion which is representsan interesting portion of the selected audio content item, a user'sbrowsing of a multitude of audio content items may be facilitated inthat the user may find what he or she is looking for quicker.

In the detailed description hereinabove, for purposes of explanation andnot limitation, specific details are set forth in order to provide athorough understanding of various embodiments described in thisdisclosure. In some instances, detailed descriptions of well-knowndevices, components, circuits, and methods have been omitted so as notto obscure the description of the embodiments disclosed herein withunnecessary detail. All statements herein reciting principles, aspects,and embodiments disclosed herein, as well as specific examples thereof,are intended to encompass both structural and functional equivalentsthereof. Additionally, it is intended that such equivalents include bothcurrently known equivalents as well as equivalents developed in thefuture, i.e., any elements developed that perform the same function,regardless of structure. Thus, for example, it will be appreciated thatblock diagrams herein can represent conceptual views of illustrativecircuitry or other functional units embodying the principles of thedescribed embodiments. Similarly, it will be appreciated that any flowcharts and the like represent various processes which may besubstantially represented in computer readable medium and so executed bya computer or processor, whether or not such computer or processor isexplicitly shown. The functions of the various elements includingfunctional blocks, may be provided through the use of hardware such ascircuit hardware and/or hardware capable of executing software in theform of coded instructions stored on the above-mentioned computerreadable medium. Thus, such functions and illustrated functional blocksare to be understood as being either hardware-implemented and/orcomputer-implemented, and thus machine-implemented. In terms of hardwareimplementation, the functional blocks may include or encompass, withoutlimitation, digital signal processor (DSP) hardware, reduced instructionset processor, hardware (e.g., digital or analog) circuitry includingbut not limited to application specific integrated circuit(s) [ASIC],and/or field programmable gate array(s) (FPGA(s)), and (whereappropriate) state machines capable of performing such functions. Interms of computer implementation, a computer is generally understood tocomprise one or more processors or one or more controllers. Whenprovided by a computer or processor or controller, the functions may beprovided by a single dedicated computer or processor or controller, by asingle shared computer or processor or controller, or by a plurality ofindividual computers or processors or controllers, some of which may beshared or distributed. Moreover, use of the term “processor” or“controller” may also be construed to refer to other hardware capable ofperforming such functions and/or executing software, such as the examplehardware recited above.

In some embodiments, the present invention includes a computer programproduct which is a non-transitory storage medium or computer readablemedium (media) having instructions stored thereon/in which can be usedto program a computer to perform any of the processes of the presentinvention. Examples of the storage medium can include, but is notlimited to, any type of disk including floppy disks, optical discs, DVD,CD-ROMs, microdrive, and magneto-optical disks, ROMs, RAMs, EPROMs,EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic or optical cards,nanosystems (including molecular memory ICs), or any type of media ordevice suitable for storing instructions and/or data.

Modifications and other variants of the described embodiments will cometo mind to one skilled in the art having benefit of the teachingspresented in the foregoing description and associated drawings.Therefore, it is to be understood that the embodiments are not limitedto the specific example embodiments described in this disclosure andthat modifications and other variants are intended to be included withinthe scope of this disclosure. For example, while certain gestures (e.g.,hovering gestures, press gestures, and tap gestures) have been describedto exemplify some embodiments of the invention, other conceivablegestures also exist (e.g. flick gestures, swipe gestures, swipe-and-holdgestures, release-of-hold gestures) that could be contemplated whenreducing embodiments of the invention into practice. Furthermore,although specific terms may be employed herein, they are used in ageneric and descriptive sense only and not for purposes of limitation.Therefore, a person skilled in the art would recognize numerousvariations to the described embodiments that would still fall within thescope of the appended claims. As used herein, the terms“comprise/comprises” or “include/includes” do not exclude the presenceof other elements or steps. Furthermore, although individual featuresmay be included in different claims, these may possibly advantageouslybe combined, and the inclusion of different claims does not imply that acombination of features is not feasible and/or advantageous. Inaddition, singular references do not exclude a plurality.

What is claimed is:
 1. A method for streaming an audio content item toan electronic device, wherein the method is performed by a computerserver system comprising one or several computer servers and wherein themethod comprises: receiving a first data message comprising instructionsfrom an electronic device to return a preview segment associated with aselected audio content item, the preview segment being a portion of theselected audio content item, and a second data message comprisinginstructions from the electronic device to return the selected audiocontent item; analyzing the selected audio content item to locate aportion of the selected audio content item to be used as the previewsegment, including: determining a starting position for the portion ofthe selected audio content item to be used as the preview segment, thestarting position determined based on detection of an increase inamplitude variation in the selected audio content item; and determiningan ending position of the portion of the selected audio content itembased on a predefined duration of time after the starting position;extracting the located portion of the selected audio content item fromthe selected audio content item; partially encrypting the selected audiocontent item, including encrypting the remaining portion of the selectedaudio content item that is not extracted; and transmitting the selectedaudio content item, including the extracted portion of the selectedaudio content item as unencrypted and the remaining portion asencrypted, to the electronic device.
 2. The method of claim 1, furthercomprising retrieving the selected audio content item from a firststorage.
 3. The method of claim 2, further comprising: in response toreceiving the second data message including instructions from theelectronic device to return the entire selected audio content item;retrieving the entire selected audio content item from a second storage;encrypting the entire retrieved audio content item; and transmitting theencrypted audio content item to the electronic device.
 4. The method ofclaim 3, wherein the first storage and the second storage are a samestorage.
 5. The method of claim 1, wherein partially encrypting theselected audio content item includes leaving the extracted portion ofthe selected audio content item unencrypted.
 6. The method of claim 1,wherein analyzing the selected audio content item to locate the portionof the selected audio content item to be used as the preview segment,comprises: analyzing audio content from only a portion of the selectedaudio content item.
 7. The method of claim 6, wherein said portion ofthe analyzed audio content item comprises a portion having a predefinedduration.
 8. The method of claim 7, wherein the duration is 30 seconds,60 seconds or 90 seconds.
 9. The method of claim 6, wherein said portionis a portion at the beginning of the selected audio content item. 10.The method of claim 1, wherein analyzing the selected audio content itemcomprises: evaluating an audio pattern of the audio content item; andlocating one or more groups of segments within the selected audiocontent item based on the evaluation of the audio pattern, wherein thelocated portion is selected from the one or more groups.
 11. The methodof claim 10, wherein locating the one or more groups of segmentscomprises: dividing the audio content item into several equally-sizedsegments of predefined duration; comparing audio patterns of saidequally-sized segments of the audio content item; identifying thoseequally-sized segments that have same or similar audio patterns;grouping the equally-sized segments into groups, wherein each groupcomprises one or several equally-sized segments having the same orsimilar audio pattern; for each group of equally-sized segments,counting the number of equally-sized segments having the same or similaraudio pattern; and establishing the group that has the highest number ofequally-sized segments having the same or similar audio patterns; andinterpreting the group having the highest number of equally-sizedsegments with the same or similar audio patterns to represent a mostinteresting part of the audio content item; wherein locating the portionof the selected audio content item to be used as the preview segmentcomprises locating any one of the segments of the group having thehighest number of equally-sized segments and using the located segmentas the preview segment.
 12. The method of claim 11, wherein: comparingthe audio patterns of said equally-sized segments of the audio contentitem comprises comparing amplitudes of said equally-sized segments ofthe audio content item; and identifying those equally-sized segmentsthat have same or similar audio patterns comprises identifying thoseequally-sized segments that have same or similar amplitude values. 13.The method of claim 1, further comprising: evaluating amplitudevariations of the selected audio content item only for a pre-definedduration at the beginning of the audio content item; and determining thestarting position for the portion of the selected audio content itemcomprises identifying a location of the audio content item where theamplitude changes drastically, that is where the amplitude changes froma lower amplitude value to a considerably higher amplitude value withina predefined period of time.
 14. A computer server system, comprising:one or more processors; and memory storing one or more programs forexecution by the one or more processors, the one or more programsincluding instructions for performing the method of: receiving a firstdata message comprising instructions from an electronic device to returna preview segment associated with a selected audio content item, thepreview segment being a portion of the selected audio content item, anda second data message comprising instructions from the electronic deviceto return the selected audio content item; analyzing the selected audiocontent item to locate a portion of the selected audio content item tobe used as the preview segment, including: determining a startingposition for the portion of the selected audio content item to be usedas the preview segment, the starting position determined based ondetection of an increase in amplitude variation in the selected audiocontent item; and determining an ending position of the portion of theselected audio content item based on a predefined duration of time afterthe starting position; extracting the located portion of the selectedaudio content item from the selected audio content item; partiallyencrypting the selected audio content item, including encrypting theremaining portion of the selected audio content item that is notextracted; and transmitting the selected audio content item, includingthe extracted portion of the selected audio content item as unencryptedand the remaining portion as encrypted, to the electronic device.